<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        h1{
            background-color: green;
        }
        #zxu {
            color: red;
        }
        .c1
        {
            color: blue;
        }
        h2,#zxu
        {
            background-color: yellow;
        }
        *{
            border: 2px solid green;
        }
        input[type='button']{
            background-color: pink;
        }

    </style>
</head>
<body>
<ul>
    <li class="c1">刘德华</li>
    <li id="zxu">张学友</li>
    <li>郭富城</li>
</ul>
<h1>苹果</h1><h1>香蕉</h1><h1 class="c1">榴莲</h1>
<h2 class="c1">洗衣机</h2>
<input type="submit" value="提交按钮">
<input type="button" value="普通按钮">
</body>
</html>